How to unmount a filesystem in Linux without investigating why is it busy?
I want to do it in one command. It should handle applications using that filesystem, submounts, containers (lxc-execute -n qqq <command>
) and all other things.
Just "unmount. No objections!". Special kernel patches or configuration is allowed.
Filesystem should be really unmounted, so umount -l
is certainly not an option. For example, for cryptsetup remove
(BTW how to forcibly cryptsetup remove
? Update: cryptsetup luksSuspend
, but you won't be able to cryptsetup luksResume
if it is not LUKS).
How to make all filehandles on that filesystem invalid?
The only reliable way I know is mounting the filesystem through the FUSE (there is usually no problem to unmount FUSE thing because of I can just kill it's process).
P.S. Already know mount fuser
, lsof | grep
, cat /proc/*/mounts | grep
and obsolete non-working "badfs patch".